Earlier today I was using my bionic and the wallpaper changed to some random one, and when I tried to change it, nothing happened. So I pulled the battery to try and solve the problem. My phone has not worked since. I try to turn it on, and half the time i get to the actual homescreen but it won't let me unlock. I can receive calls and answer them, but nothing other than that. Finally my phone had a message pop up saying "Activity Home screen (in app home screen) is not working" Tried to force close and nothing happened. Any advice?